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Note 1 - Condensed Consolidated Financial Statements - Business Overview and Significant Accounting Policies Business Overview and Significant Accounting Policies(Details)
$ in Thousands, shares in Millions
3 Months Ended 9 Months Ended 12 Months Ended 15 Months Ended
Jan. 27, 2017
USD ($)
shares
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
segment
Sep. 30, 2016
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2018
USD ($)
Aug. 09, 2017
USD ($)
Dec. 31, 2015
USD ($)
Basis of Presentation and Business Overview [Line Items]                      
Securities Lending Rate of Collateral Required         1.02            
Business Overview [Abstract]                      
Number of Operating Segments | segment         2            
Mortgage Insurance [Abstract]                      
Loss on induced conversion and debt extinguishment   $ (45,766)   $ (17,397) $ (51,469) $ (75,075)          
Restructuring and other exit costs   12,038   0 12,038 0          
Restructuring and other exit costs - cash payments   5,400                  
Impairment of goodwill (Note 6)   0   0 184,374 0          
Finite-Lived Intangible Assets, Net   $ 56,045     $ 56,045            
Repurchase Agreements, Securities Lending Transactions, and Repurchase-to-Maturity Transactions Accounted for as Secured Borrowings, Description of Potential Risks         Under our securities lending agreements, the Borrower generally may return the loaned securities to us at any time, which would require us to return the collateral within the standard settlement period for the loaned securities on the principal exchange or market in which the securities are traded. We manage this liquidity risk associated with cash collateral by regularly monitoring our available sources of cash and collateral to ensure we can meet short-term liquidity demands in both normal and stressed scenarios. We may use our general liquidity resources to meet any potential cash demands when loaned securities are returned to us. The credit risk under these programs is reduced by the amounts of collateral received. On a daily basis, the value of the underlying securities that we have loaned to the Borrowers is compared to the value of cash and securities collateral we received from the Borrowers, and additional cash or securities are requested or returned, as applicable. In addition, we are indemnified against counterparty credit risk by the intermediary.            
Mortgage Insurance Segment                      
Mortgage Insurance [Abstract]                      
Private Mortgage Insurance Protects Lenders For Loans Made With Less Than This Maximum Down Payment Percentage   20.00%     20.00%            
Private Mortgage Insurance Protects Lenders For Refinancings Made to Home Buyers With Less Than This Maximum Equity-Ownership Percentage   0.20     0.20            
Risk In Force   $ 51,200,000     $ 51,200,000            
Mortgage and Real Estate Services Segment [Member]                      
Mortgage Insurance [Abstract]                      
Restructuring and other exit costs   5,463   $ 0 [1] 5,463 [1] $ 0 [1]          
Impairment of goodwill (Note 6)     $ 184,400   184,374     $ 0      
Impairment of Intangible Assets, Finite-lived     15,800                
Goodwill   10,922     10,922     195,170     $ 195,170
Finite-Lived Intangible Assets, Net   56,045     56,045     $ 81,058      
Convertible Senior Notes Due 2017                      
Mortgage Insurance [Abstract]                      
Repayments of Convertible Debt     31,600                
Convertible Senior Notes Due 2019                      
Mortgage Insurance [Abstract]                      
Debt Instrument, Repurchase Amount $ 68,000                    
Repayments of Convertible Debt 110,100                    
Loss on induced conversion and debt extinguishment $ (4,500)                    
Senior Notes [Member] | Senior Notes Due 2024 [Member]                      
Mortgage Insurance [Abstract]                      
Debt Instrument, Face Amount   450,000     450,000            
Senior Notes [Member] | Senior Notes Due 2019 [Member]                      
Mortgage Insurance [Abstract]                      
Debt Instrument, Face Amount   300,000     300,000            
Debt Instrument, Repurchase Amount   141,400     141,400            
Senior Notes [Member] | Senior Notes Due 2021                      
Mortgage Insurance [Abstract]                      
Debt Instrument, Repurchase Amount   152,300     152,300            
Senior Notes [Member] | Senior Notes due 2019, 2020, and 2021 [Member]                      
Mortgage Insurance [Abstract]                      
Loss on induced conversion and debt extinguishment   (45,800)                  
Senior Notes [Member] | Senior Notes Due 2020                      
Mortgage Insurance [Abstract]                      
Debt Instrument, Repurchase Amount   115,900     $ 115,900            
Convertible Debt | Convertible Senior Notes Due 2017                      
Mortgage Insurance [Abstract]                      
Debt Instrument, Repurchase Amount     21,600                
Loss on induced conversion and debt extinguishment     $ (1,200)                
Convertible Debt | Convertible Senior Notes Due 2019                      
Mortgage Insurance [Abstract]                      
Reduction in Dilutive Shares Attributable to Redemption of Conversion of Debt Securities | shares 6.4                    
Total Primary Insurance Mortgage Insurance Products [Member] | Mortgage Insurance Segment                      
Mortgage Insurance [Abstract]                      
Concentration Risk, Percentage         98.20%            
Pool Insurance Mortgage Insurance Product [Member] | Mortgage Insurance Segment                      
Mortgage Insurance [Abstract]                      
Concentration Risk, Percentage         1.60%            
Third Quarter 2017 Repurchase Program [Member]                      
Mortgage Insurance [Abstract]                      
Stock Repurchase Program, Authorized Amount                   $ 50,000  
Hurricanes Harvey and Irma [Member] | Mortgage Insurance Segment                      
Mortgage Insurance [Abstract]                      
Concentration Risk, Percentage         8.80%            
Risk In Force   $ 4,400,000     $ 4,400,000            
Securities Financing Transaction, Fair Value [Member]                      
Basis of Presentation and Business Overview [Line Items]                      
Securities Lending Rate of Collateral Required         1.00            
Scenario, Forecast [Member]                      
Mortgage Insurance [Abstract]                      
Restructuring and other exit costs             $ 7,500   $ 19,500    
Restructuring and other exit costs - cash payments             $ 6,000        
Scenario, Forecast [Member] | Asset Impairment Charges [Member]                      
Mortgage Insurance [Abstract]                      
Restructuring and other exit costs                 8,100    
Scenario, Forecast [Member] | Employee Severance and Benefit Costs [Member]                      
Mortgage Insurance [Abstract]                      
Restructuring and other exit costs                 6,900    
Scenario, Forecast [Member] | Facility and Lease Termination Costs [Member]                      
Mortgage Insurance [Abstract]                      
Restructuring and other exit costs                 2,700    
Scenario, Forecast [Member] | Contract Termination and Other Restructuring Costs [Member]                      
Mortgage Insurance [Abstract]                      
Restructuring and other exit costs                 $ 1,800    
[1] Primarily includes employee severance and related benefit costs. Does not include impairment of long-lived assets, which is not considered a component of adjusted pretax operating income.